SANDIVER
Etymology
From Old French suin de verre, suint de verre, literally "grease of glass".
Noun
sandiver (uncountable)
A scum that forms on molten glass.
Anagrams
• invaders, vianders
Source: Wiktionary
San"di*ver, n. Etym: [Perh. fr. OF. sa\'8bn grease, fat + de of +
verre glass (cf. Saim), or fr. F. sel de verre sandiver.]
Definition: A whitish substance which is cast up, as a scum, from the
materials of glass in fusion, and, floating on the top, is skimmed
off; -- called also glass gall. [Formerly written also sandever.]
Source: Webster’s Unabridged Dictionary 1913 Edition